| Phenotype: | primary motor neuron axon terminus swollen, abnormal |
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| Note: | This statement combines anatomy and/or ontology terms with phenotype quality terms to create a complete phenotype (EQ) statement. For detailed information on individual terms, click the hyperlinked term name. |
| Name: | primary motor neuron |
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| Synonyms: | primary motoneuron |
| Definition: | Motor neurons that arise during the first day of development. Primary motoneurons have larger diameter cell bodies and axons than secondary motoneurons and are positioned more dorsally and medially than secondary motoneurons. Primary motoneurons are present in a single bilateral pair of clusters in each spinal segment and innervate axial muscle fibers in the corresponding pair of myotomes. Axons make a conspicuous loop around the Mauthner axon before entering the ventral root. |
| Ontology: | Anatomy Ontology [ZFA:0009244] |
| Name: | axon terminus |
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| Synonyms: | axon terminal, axon terminal specialization, motor endplate, nerve ending |
| Definition: | Terminal inflated portion of the axon, containing the specialized apparatus necessary to release neurotransmitters. The axon terminus is considered to be the whole region of thickening and the terminal button is a specialized region of it. |
| Ontology: | GO: Cellular Component [GO:0043679] QuickGO AmiGO |
| Name: | swollen |
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| Synonyms: | swelling |
| Definition: | A structure quality inhering in a bearer by virtue of the bearer's exhibiting transient abnormal enlargement, not due to cell proliferation. |
| Ontology: | Phenotypic Quality Ontology [PATO:0001851] |